money = eval(input("请输入一个数额："))
rate = eval(input("请输入一个年利率："))
month = eval(input("请输入月份："))

all_money = 0
for i in range(1,month+1):
    all_money = (money + all_money) * (1+rate/1200)

print(month,"后，储蓄账户上的数额为：",format(all_money,".2f"))